RTC: audio packet jitter buffer. v7.0.48

[chundonglinlin]

Rtp packets may be retransmitted, disordered, jittery, delayed, etc.There may be abnormalities when converting to rtmp.

To reproduce this problem, you need to set the network reordering by tc-ui. Note that you need a linux server, and start it by docker:

docker run --network=host --privileged -it --restart always -d \
    --name tc -v /lib/modules:/lib/modules:ro ossrs/tc-ui:1

Set up 5% packet reordering and a 1ms delay; then you will notice that the audio is stuttering, somewhat noisy, and lacks fluency.

curl http://localhost:2023/tc/api/v1/config/raw -X POST \
  -d 'tcset ens5 --direction incoming --delay 40ms --reordering 5% --port 8000'

Note: Even without network conditions, the natural state can also cause packet reordering, especially in public cloud platforms such as AWS EC2.

Note: You can use command curl http://localhost:2023/tc/api/v1/config/raw -X POST -d 'tcdel --all ens5' to reset the network condition settings.

Check the web console, you will see the reordering setup:

Then, publish stream via WHIP: http://localhost:8080/players/whip.html

And, play via HTTP-FLV: http://localhost:8080/players/srs_player.html

Finished by AI:

• AI: Extract audio jitter buffer to class AudioPacketCache
• AI: Add utest and fix bug.

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Co-authored-by: Haibo Chen 495810242@qq.com